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GPS re org
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<H1>F-droid logo</H1>
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<p>Downloaded Creative Commons</p>
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<p class="caption">Photo © Philip Sargent, 2026</p>
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Don't Kill My App logo
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<H1>Don't Kill My App logo</H1>
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<p>downloaded loga</p>
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<p class="caption">Photo © Philip Sargent, 2026</p>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<meta http-equiv="Content-Type" content="text/html; charset=utf8" />
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OSMand
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<link rel="stylesheet" type="text/css" href="/css/main2.css" />
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<H1>OSMand</H1>
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<div class="centre"><img alt="" src="/handbook/computing/i/osmand-icon.jpg" />
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<p>OSMand icon, Creative Commons</p>
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<p class="caption">Photo © Philip Sargent, 2026</p>
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@@ -2,9 +2,13 @@
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<h1>My Phone on Expo</h1>
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<h2>Before Expo</h2>
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<p>Since 2019 it has become apparent that many people have not been properly prepared for Expo.<figure class=onright width=20><a href="https://osmand.net/"><img width=64px src='/handbook/computing/t/osmand-icon.jpg' /></a></figure>
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<p>Since 2019 it has become apparent that many people have not been properly prepared for Expo.<figure class=onright width=20><a href="https://osmand.net/"><img width=64px src='/handbook/computing/t/osmand-icon.jpg' /></a></figure>
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<p>This is what you need to do:
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<ul>
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<li>Fix the (broken) wi-fi default for your phone's location setting
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<li>Fix the (broken) privacy default for uploading photos to the Expo Google photo album and the expo blog
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<li>Fix the (broken) wi-fi default for your phone's location setting
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<li>Fix the (broken) privacy default for uploading photos to the Expo Google photo album and the expo blog
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<li>Decide on two or three people you will share your location with for the duration of expo - people who are on expo at the same time.
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@@ -14,6 +18,16 @@
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<li>Download and install GPStest
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</ul>
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<p><figure class=onright width=20>
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<a href='https://dontkillmyapp.com/'><img width=64px
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src='/handbook/computing/t/dkma.jpg' /></a> </figure>
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For the latest updates on why "battery saver" kills accurate location for the most recent phones, go to: <a href="https://dontkillmyapp.com/">dontkillmyapp.com</a>
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<li>Fix the <em>seriously</em> broken default for recording your GPS track when you are walking in the plateau.<figure class=onright width=20><a href='https://github.com/barbeau/gpstest#readme'><img width=64px src='/handbook/computing/t/gpstest.jpg' /></a><a href='https://github.com/barbeau/gpstest#readme'> <img width=64px src='/handbook/computing/t/F-Droid_Logo_4.svg.jpg' /></a>
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</figure>
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<li>Download and install OSMand
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<li>Download and install GPStest
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</ul>
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<p><figure class=onright width=20>
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<a href='https://dontkillmyapp.com/'><img width=64px
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src='/handbook/computing/t/dkma.jpg' /></a> </figure>
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@@ -67,6 +81,9 @@ tbd
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<p>You will probably be familiar with real-time, continuous sharing of location using Google Maps or Apple, but there are <a href="https://en.todoandroid.es/Complete-guide-on-how-to-send-your-location-from-an-Android-phone-using-all-methods./">several apps</a> that do this.
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<p>Note that you do want <em>continuous</em> location sharing, so that when you fall down a hole and lose signal, we know where the top of the hole is.
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<p>You will probably be familiar with real-time, continuous sharing of location using Google Maps or Apple, but there are <a href="https://en.todoandroid.es/Complete-guide-on-how-to-send-your-location-from-an-Android-phone-using-all-methods./">several apps</a> that do this.
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<p>Note that you do want <em>continuous</em> location sharing, so that when you fall down a hole and lose signal, we know where the top of the hole is.
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<h3>Disabling GPS "energy saving" modes</h3>
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<h4>Why</h4>
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@@ -79,11 +96,13 @@ tbd
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<p>If you have standard battery saving set up, when you start up OSMand and start recording a track, it will do a popup telling you about how to turn off battery saving.
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<p>What you need to do seems to be correlated with how expensive your phone is. A Xioami Redmi 12 phone in 2024 worked with just the OSMand and battery saving fetures disabled as described above. But in 2025 a Blackview Wave8 phone would not produce a useable OSMand track at all until the "GPStest" app (see below) was also run continuously and with notifications and logging enabled.
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<p>What you need to do seems to be correlated with how expensive your phone is. A Xioami Redmi 12 phone in 2024 worked with just the OSMand and battery saving fetures disabled as described above. But in 2025 a Blackview Wave8 phone would not produce a useable OSMand track at all until the "GPStest" app (see below) was also run continuously and with notifications and logging enabled.
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<h3 id="temp">Temporary Google Photos</h3>
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<p>When anyone shares photos on a "Shared Album" in Google Photos, they are only visible so long as the original photographer keeps the photos on their device: there are loads of photos by Harry Kettle from 2023 which are visible only as blank rectangles on the Shared Album because he has cleared out his photo album on his google account. (This really is a "share" not an "upload".)
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<p>So unless the photo is utterly trivial and disposable, please also upload the photos using the <a href="/photoupload/">"Upload Photos"</a> page on the website <em>before</em> you delete them from your device.
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<p>We would rather you didn't use Google Photos at all really, but people will willy-nilly, so let's at least use the <em>same</em> Google photos album each year.
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@@ -96,6 +115,7 @@ Go on to <a href="/handbook/computing/gpxupload.html">Saving your GPS tracks</a>
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Go on to <a href="/handbook/survey/newcave.html">Next survey guide page</a> - 'Base Camp: getting it in to the computer'<br />
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<br />
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<br />
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<div class="text-box">
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<a href="/handbook/computing/myphone.html">Your phone on expo</a> - Do not select the "high accuracy" location setting on your phone (this page)<br />
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<a href="/handbook/essentials.html">GPS essentials on the plateau</a> - Safety information<br />
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@@ -20,8 +20,8 @@
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<h3>What EVERYONE needs to do</h3>
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<ul>
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<li>Install a GPS app on your phone.</li>
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<li>Check <a href="computing/myphone.html">your phone</a> configuration.</li>
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<li>Download the locations of key cave entrances, camps and other landmarks and the paths between them.</li>
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<li>Modify <a href="computing/myphone.html">your phone</a> configuration for the plateau</li> (<em>important</em>).
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<li>Learn how to use <a href="/handbook/survey/gps.htm">expo GPS with key cave entrances</a>, camps and other landmarks and the paths between them.</li>
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<li>When walking on the plateau, turn on <b>location tracking</b> in Google Maps, or your GPS app, before you leave the car park and share your location with someone you know at base camp and/or top camp.</li>
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</ul>
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<p><b>Don't be misled by the apparent simplicity</b> of the tracks. The plateau is very broken and is an unremitting extent of cliffs, holes and impassable dwarf-larch scrub ("bunde" as it is known on expo). You can be 5m from the route and have lost it entirely. The <a href="/guidebook/walkin.htm">walk to and from</a>
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@@ -169,9 +169,11 @@ This should work the same way whether you have an iPhone or an Android phone.
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<p>This (nerds only) has been moved to a separate page: <a href="/handbook/essentials_make.html">regenerating essentials.gpx</a>.
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<hr />
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<br />
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<div class="text-box">
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<a href="/handbook/computing/myphone.html">Your phone on expo</a> - Do not select the "high accuracy" location setting on your phone<br />
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<a href="/handbook/essentials.html">GPS essentials on the plateau</a> - Safety information (this page)<br />
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<a href="/logbookentry/2024-07-21/2024-07-21c">Photo GPS</a> - Is unreliable unless you follow procedure<br />
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<a href="/handbook/survey/gps.htm">Locating entrances by GPS</a> - from the survey handbook section<br />
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<br /></body>
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<a href="/handbook/survey/gps.htm_edit">Locating Entrances</a> - expo recommended methods<br />
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</div></body>
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@@ -9,6 +9,8 @@
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<h3>First actions</h3>
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<p>First of all, you need to <a href="/handbook/computing/myphone.html">set up your phone</a> in "expo mode" for recording locations on the plateau reliably. This is not just some technical settings, it also means a particular style of useage whch you need to learn.
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<h3>Which point to fix</h3>
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@@ -28,8 +30,14 @@ otherwise with a restricted view of the sky, then choose instead a good
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landmark with a wide, clear view of the sky, and with at least two survey shots
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of the entrance. </p>
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<p>Yes, you will have to manually do a surface survey leg using your survey instruments between the GPS point and the cave entrance tag station, and record that in your cave survex file.
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<p>Yes, you will have to manually do a surface survey leg using your survey instruments between the GPS point and the cave entrance tag station, and record that in your cave survex file. <h3>Calibrate/document your phone's capabilities</h3>
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<figure class=onright width=20><a href='https://github.com/barbeau/gpstest#readme'><img width=64px src='/handbook/computing/t/gpstest.jpg' /></a><a href='https://github.com/barbeau/gpstest#readme'> <img width=64px src='/handbook/computing/t/F-Droid_Logo_4.svg.jpg' /></a>
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</figure>
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Install the "GPS Test" app, this one: <a href="https://play.google.com/store/apps/details?id=com.android.gpstest">GPS TEST</a> and check whether your phone is using SBAS "Satellite-based Augmentation Services", which is another name for EGNOS, the differential GPS system.
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You need to record if SBAS is in operation whenever you record the position of a cave entrance (and ideally whenever you take a photo too, but that would be unrealistic). [ Philip Balister takes a screen-shot of the GPStest screen whenever he want a proper GPS location. A notebook and pencil are also valuable adjuncts when looking at lots of entrances: use the timestamp on the screenshots to correlate everything. ]
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<p>Since 2018 we have differential GPS which renders historical advice obsolete (e.g. Wookey's 1996 article) but altitudes are still always inaccurate
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and GPS devices don't generally tell you how inaccurate they are. Also phones are now much more complicated than the dedicated GPS devices used in the past. It is now
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<a href="/handbook/computing/myphone.html">the phone itself</a> we have to worry about, not just GPS. Phones try to be "helpful" these days and do not tell you what they are doing.
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@@ -75,10 +83,19 @@ too.</b></p>
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<p>We all use the same coordinate system WGS84 these days, so <a href="coord2.html">the extensive discussion
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on coordinate systems</a> has been moved to a different page. If you are really interested you can read
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<a href="coord.htm">Olaf's article</a>too.
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<h3 id="future">The future</h3>
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<p> <a href="https://www.cavinguk.co.uk/info/locatingsurveys.html">Location fixing: How to obtain a fixed point for a cave survey</a> (2020) .Galileo High Accuracy Service (HAS) was due to become available in 2024, which would offer RTPPP for free around the world - but it's still not really working for most people.
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This is an excellent article and nearly all of it is still absolutely true, e.g.:
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<blockquote>Keep the device very still. If the position shown by GPSTest slowly refines then stops updating within a minute or two, or shows only the last digit changing slowly, <em>then your device cannot be used for averaging</em>. A device with 1 metre accuracy still shows the 6th and 7th decimal place digits of the longitude and latitude updating every second or so (that is a roughly 10 cm wobble every second). Unless your device can actually do 1 cm accuracy, you should be seeing those numbers change! In general, this makes most phones unusable for this purpose"</blockquote>
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<p>Unfortunately RTPPP has not actually caught on [2025] and it is still only available for experts and phones supporting L2 and L5 frequencies have been slower to appear than we hoped. Read Wikipedia on <a href="https://en.wikipedia.org/wiki/Real-time_kinematic_positioning">Real-time kinematic positioning (RTK)</a>.
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<hr />
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<a href="newcave.html">Next survey guide page</a> - 'Base Camp: getting it in to the computer'<br />
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<br />
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<div class="text-box">
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<a href="/handbook/computing/myphone.html">Your phone on expo</a> - Do not select the "high accuracy" location setting on your phone<br />
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<a href="/handbook/essentials.html">GPS essentials on the plateau</a> - Safety information<br />
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<a href="/logbookentry/2024-07-21/2024-07-21c">Photo GPS</a> - Is unreliable unless you follow procedure<br /></body>
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<a href="/logbookentry/2024-07-21/2024-07-21c">Photo GPS</a> - Is unreliable unless you follow procedure<br />
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<a href="/handbook/survey/gps.htm_edit">Locating Entrances</a> - expo recommended methods (this page)<br />
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</div></body>
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</html>
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